Telegraph system.



No. 757,504. PATENTEDAPR. 19, 19,04.

' H. 0. HUGH.

TELEGRAPH SYSTEM. 7 APPLIOATIOH FILED AUG. 31, 1903.

10 MODEL.

l l l i Hiillilmy fgggf z-zmim U NIT-ED STATES Patented April 19, 1904.

PATENT- O FIC J HARRY O. Been, on crncAeo, ILLINOIS, AssI'eNoR To WESTER TELEG- RAPHONE COMPANY, SOUTH DAKOTA.

OF CHICAGO, ILLINOIS, A CORPORATION OF TELEGRAPH SYSTEM.

SPECIFICATION forming part of Letters Patent No. 757,504, dated April 19, 1904. I

ApplicationffiledAugnst31,1903i seiaiiro. 171,399. (No model.)

To all whom it may concern: I Be it known that I, HARRY 0. HUGE, a citizen of the-United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telegraph Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification. My invention relates to telegraphy, and'has for its object the provision of means whereby wave-form current of sufiiciently high fre quency, as that occasioned by suitable alternating-current generators, may be used in telegraphy, the invention enabling the simultaneous use of those instruments operable by direct current and those operable by waveform current upon the same transmission-line. My invention will be fully pointed out in the following specification and claims and illustrated in the accompanying drawings, in which Figure 1 illustrates the preferred embodi 'ment of my invention. Fig. 2 is a view in elevation of the line-relay.

Like parts are indicated by similar characters of reference in both views. I have indicated-a transmission-line 1 common to aplurality of telegraph-stations 2, 3, 4, 5,'and 6. It is understood that'thenum ber of each kind of stations may be varied, At stations 2 and 6 are'indicated ordinary telegraphic outfits, each including a line-relay 7', normally energized by a'battery 8, a sendingkey 9, and a sounder 10, whose magnet is included in-a local circuit, there being but one local circuit to each of thestations 2 and 6. Additional impedance 7 may be included in the line if said line-relays do not offer enough to the wave-formcurrent impressed upon the line. Condensers 11 may be included in grounded branches from the line 1 before reaching the end stations to complete circuit for the wave-form, telegraphic currents.

I have indicated the apparatus at stations 3, 4, and 5 in circuits in inductive relation to the main-line circuit, transformer-windings 12 being included in the main line that are in inductive relation to transformer-windings 13 contained in the station-circuits, these windings preferably having atransformer ratio of one to one, each being, say, of one hundred ohms resistance. I do not wishto be limited, however, to this means for securing the presence of waveform current in the apparatus at stations 3, 4, and 5. At each of these stations there is a line-relay 14, each preferably including a permanently magnetized core 15, whose winding may be, say, of one hundred ohms resistance and subject to the wave-form current impressed upon the line at a sending-station and reproduced in the receiving-circuits at the receiving-stations. A sounder-magnet is provided at each of the stations 3, 4, and 5, this magnet having differential coils 16 and 17 upon a common magnetizalole core 18, the he- ;lix 16 being included in anormally closed circuit containing the line relay contact elements 19 'and'20,while the helixl? is preferably included in a permanently closed local circuit independent of the circuit containing helix 16. When wave-form telegraphic current is impressed upon the line-relay, the contacts 19 and- 20 are separated, due to the rapid vibration of contact element 19, which is preferably asoftiron diaphragm. The coil 17 is thereupon aloneenergized, causing the attraction of the sounder-armature.-' In order that the line-relay may most effectively operate, the contact 20, which is a moving or traveling contact, is carried upon a pivoted arm 21, to which a weight-22 is added, a spring 23 being also supplied to regulate the degree of engagement of said contact with the diaphragm. Thedifi'erential coils are preferably supplied from a battery 24 common to both local circuits containing the coils. The source of waveform current is desirably an alternating-current generator 25, mechanically driven at a speed to produce the required frequency or periodicity. I have indicated such a generator at each station; but obviously it is-only necessary to have at the stations the conductors carrying the current to act as currentsupplies. A sending-key or switching mechanism 26 is provided at each station. This key is shown permanently connected with one side of the local transformer-circuit, the alternate contact 27 of each key being connected with the other side of the transformer-circuit through the generator 25, whereby when a key at a sending-station is depressed the coil 13 at that station is included in circuit with the generator, and through the agency of the companion coil 12 current is propagated to the line-circuit comprising the grounded condensers 11 and the coils 12 intervening between said condensers, causing in turn the induction of operating current in the local transformer-circuits at the receiving-stations.

As will be observed, the helix of each relay 14: has one terminal permanently connected with a winding 13, while the other terminal of the helix is connected with the other terminal of said winding through a resistance-coil 28 (that desirably furnishes impedance) when key 26 is depressed and also through said key and its normal contact 29 independently of coil 28 and through resistance 28 as Well when said key is released, Said resistance is in series with the relay, and when in the form of wire may, for example, be of five hundred ohms. At station 5 said resistance is in the form of a condenser, which may have a capacity of three microfarads. The resistance is preferably adjustable, so that the amount of current flowing through the same and the relay at the sending-station may be regulated. The conductor or portion of the path through the relay that contains the normal contact of the sending-key is of low ohmic resistance in shunt of'or in parallel with the resistance 28, whereby the relays may be fully operated at the receiving-stations. As will be seen, when the key 26 at a sending-station is depressed the generator 25 is included in parallel with the conductor containing both the relay and the impedance,a portion of the telegraphic current thus going to operate the apparatus at the home station, while the balance is employed for the other stations.

I have adopted a key having familiar characteristics as the preferred form of sending switching mechanism.

It is obvious that changes may readily be made in the system and apparatus of the embodiment of the invention shown without departing from the spirit of the invention.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, the following:

1. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station, a sending-key at each station, a line-relay at each station comprising a permanent magnet as a core for the helix of the relay, 2. vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; a telegraphic sounder whose magnet has two differentially-wound helices, and two independent circuitseachcontainingasounderhelix, one of said circuits being closed through the contacts of the relay while the other circuit is permanently closed, substantially as described.

2. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; r a supply of wave-form current at each station, a sending-key at each station, a line-relay at each station comprising a permanent magnet as a core for the helix of the relay, a Vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; a telegraphic sounder whose magnet has two differentially-wound helices, and two independent circuits each containing a sounder-helix, one of said circuits being closed through the contacts of the relay, substantially as described.

, 3. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station, a sending-key at each station, a line-relay at each station including a vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; a telegraphic sounder whose magnet has two differentially-wound helices, and two independent circuits each containing asounder-helix, one of said circuits beingclosed through the contacts of the relay while the other circuit is permanently closed, substantially as described.

4. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; asupply of wave-form current at each station, a sending-key at each station, a line-relay at each station including a vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; a telegraphic sounder whose magnet has two differentially-wound helices, and two independent circuits each containing a sounder-helix, one of said circuits being closed through the contacts of the relay, substantially as described.

5. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station, a line-relay at each station comprising a permanent magnet as a core for 'the helix of the relay, a vibratory contact '6. A system of telegraphy comprising a,

transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station, a line-relay at each station comprising a permanent magnet as a core for the helix of the relay, a vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; telegraphic-sounder apparatus controlled by the contacts of each relay, sending-key mechanism at each station for associating the current -supply thereat with said line, said key having an alternate contact constituting a terminal of said supply whereby when the key is actuated said supply is operatively associated with the telegraphline, said key also having a normal contact connected with a relay-terminal, and a resistance also connected between said relay-terminal and said key independently of the normal contact, substantially as described.

7 A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station, a line-relay at each station including a vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessing inertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; telegraphic-sounder apparatus controlled by the contacts of each relay, resistance to the current emanating from said supply, a sending-key mechanism and circuit connections whereby said resistance and relay are together included in parallel of said supply when the key is operated at a sending-station, substantially as described.

8. A system of telegraphy comprising transmission-line uniting a plurality of telegraph stations; a supply of wave-form current at each station, a line-relay at each station including a vibratory contact element actuated by the magnet of the relay, and a traveling contact element possessinginertia and normally resting against said vibratory contact element but separable therefrom through the agency of wave-form current impressed upon the relay; telegraphic-sounder apparatus controlled by the contacts of each relay, sendingkey mechanism at each station for associating the current-supply thereat with said line, said key having an alternate contact constituting a terminal of said supply whereby when the key is actuated said supply is operatively associated with the telegraph-line, said key also having a normal contact connected with a re lay-terminal, and a resistance also connected between said relay-terminal and said key independently of the normal contact, substantially-as described.

9. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; asupply of wave-form current at each station; a line-relay at each station comprising a permanent magnet as a core for the helix of the relay, two contact elements normally in engagement controlled by the linerelay; a circuit at each station including said elements, and a telegraph-sounder controlled by said circuit, said sounder having a controlling-magnet with difi'erential coils, one of said coils being included in a circuit including the relay-contacts, substantially as described.

10. A system of telegraphy comprising a transmission-line uniting a plurality of telegraph-stations; a supply of wave-form current at each station; a line-relay at each station comprising a permanent magnet as a core for the helix of the relay, two contact elements controlled by the line-relay; a circuit at each station including said elements, and a telegraph-sounder controlled by said circuit, said sounder having a controlling-magnet with differential coils, one of said coils being included in a circuit including the relay-contacts, substantially as described.

In Witness whereof I hereunto subscribe my name this 29th day of August, A. D1903.

HARRY 0. HUGE. Witnesses:

GEORGE L. CRAGG, CARL H. CRAWFORD. 7 

